Ruby (Supernatural)

Ruby
Supernatural character
Katie Cassidy as Ruby (left) and Genevieve Cortese as Ruby (right)
First appearance	"The Magnificent Seven"
Last appearance	"Lucifer Rising"
Created by	Eric Kripke
Portrayed by	Katie Cassidy (Season 3) Genevieve Cortese (Season 4)
Information
Species	Demon
Gender	Female
Significant other(s)	Sam Winchester (lover)
Abilities	Demonic possession Invulnerability Occult knowledge Superhuman strength Telekinesis Teleportation

Ruby is a fictional character on The CW Television Network's Supernatural portrayed mainly by actresses Katie Cassidy and Genevieve Cortese. Created by the writers to expand on the characterization of demons within the series, she first appears in the third season, wherein she assists series protagonists Sam and Dean Winchester in fighting her fellow demons. By the fourth season, she has won Sam's trust and begins training him to kill demons with his psychic powers, though Dean remains fearful of ulterior motives. The character departs the series at the end of the fourth season. Though the fans at first reacted negatively towards Cortese replacing Cassidy after the third season, Cortese and creator Eric Kripke felt that they became more accepting as the fourth season progressed. While fan response to the character was mixed overall, critical reception was generally negative. A common criticism was underwhelming performances by Cassidy and Cortese.

Debuting in the third season premiere "The Magnificent Seven", Ruby (Katie Cassidy) trails Sam Winchester—a hunter of supernatural creatures—and eventually rescues him from a group of demons, whom she kills with her unique demon-killing knife. She reveals her identity to Sam in "The Kids Are Alright", but claims to be different from other demons and wants to help Sam fight them. In return for his cooperation, she promises to save his brother Dean from the Faustian deal he had made to resurrect Sam in the second season finale "All Hell Breaks Loose: Part 2". However, she refuses to tell Sam her motives. Though he distrusts her and Dean wants to kill her before she can harm them, Sam decides to let her continue to help him with both saving Dean and fighting the hundreds of other demons who—like Ruby—escaped Hell in the second season finale.